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Put mine on the rollers! 98 5.9 all stock minus a growler, eBay intake and 703 injectors. Put down 213whp/304wtq

What gear, etc, did you dyno in? Also, what kind of dyno? Those are some damn good numbers for something that close to stock!

I'll be doing mine in the spring when a local place up here in Rochester has a cheap dyno day, and with the manual TC lock switch, I should be able to get a nice pull in 3rd with the TC locked.

For anyone else wondering how to put one of these in, it's really easy (my instructions will work on any 46RE or 44RE with a JTEC PCM, they'll also work on a 42RE JTEC, but it's probably a different pin on the PCM). Find the wire coming from pin 11 of the center PCM connector, and install a switch that grounds it through either a 33 or 50 ohm resistor (the resistor is to prevent a CEL). It'll lock in 2nd, 3rd or 4th, but not 1st or manual 2nd (unless you mod the valve body to allow it). Try not to let it upshift while locked though. When you're in 3rd or 4th with it locked, it won't downshift, even at WOT until you unlock the TC (unless you're going slow enough for a kickdown to 1st, which it'll do after unlocking the converter, pulling into manual 2nd will also unlock and downshift, however, turning OD off will stay in 4th until you unlock).

For a dyno pull with the manual lock switch, you want to get up to around 40 with OD off, lock the converter and then go for it. That should give useful data from 2000 rpm until redline.

Wow....My cam most have dropped the torque quite a bit. I put down 226whp and 271wtq with my 5.2

I don't think you lost any peak torque, actually, you probably gained some. Keep in mind, a stock 5.2 is 300 ft. lbs. at the crank, so accounting for drivetrain loss, it would be around 220 - 260 at the wheels, depending on how high / low the dyno you're on reads.

Sheets hard to see but stock run netted 209hp and 249 tq. But this test didnt start til higher in the rpm so the tq isn't where it should be. On the 93 oct tune w the sct it put down 222hp and 353tq. This run started a bit lower, 3100rpm compared to almost 3650 rpm on the first run. I suspect my tq # on the stock run would be significantly higher at the lower rpm.

Now I have a real starting point to work on, headers, 3" exhaust, cam, intake plenum fix, roller rockers and an msd 6a are all sitting in the garage waiting fir the TII RX7 to get finished up. The tuner suspects w this list I should be near or over the 300 hp mark with a solid tune so I'll update one it goes back on.

Any one able to analyze this graph, I dont know what the dip around 3200 is from. The SCT definatly Opened up the mid range with a nice curve.

Pretty heavily considering doing a dyno day next weekend. Would have the options of 2 wheel or all wheel. My only hold back is that my trans has been a little weird since the rebuild and im pretty sure it would be really really bad if it bucked on a dyne...thoughts?

hi guys,
has anyone ever tried on a dyno the difference between a 2wd run and a 4wd?
thanks

There will be a small loss measured due to spinning the additional parts. The 4wd dyno would be closer to what you'll actually see in the real world, as those bits are spinning even in 2wd when actually driving.

I'm pretty sure that a Dynojet will show a slightly larger difference than a Mustang dyno (load cell type). The Dynojet will see the increased rotating weight from the front driveline and wheels more than the Mustang dyno will (both will see the additional drag from rotating more driveline parts).

ok thanks, now it's clear.
I was under the impression that in 2wd all the power is going to 2 wheels so if you aren't smokin the tires you are having a better acceleration.
I'm not sure if i explained myself properly...

The power all goes to the rear, but the front drive bits are still spinning when moving down the road (they're still attached to the front wheels). So the parasitic power loss is still the same. A dyno will read slightly higher in 2wd as the vehicle isn't moving, so the front wheels, diff and driveshaft aren't spinning.

Quick question for you guys. I'll be purchasing a 5.9 shortly and I've been lurking these forums for some time. How much do 408 strokers tend to dyno? And are you guys still running 4wd or did you pull out the transfer case? Sorry if these questions are stupid/obvious.

Quick question for you guys. I'll be purchasing a 5.9 shortly and I've been lurking these forums for some time. How much do 408 strokers tend to dyno? And are you guys still running 4wd or did you pull out the transfer case? Sorry if these questions are stupid/obvious.

Hard to give a rough estimate. Really depends on the machine work you put into it besides the stroker stuff - head work probably nets you the most.

If you ask flyinryan, our resident SCT tuner, you might find you can get close to the power levels you're looking for with (I think, about a) .30 over build. A lot cheaper and leaves you more money for head work.

There are very few dedicated 2WD 5.9 ZJ builds that I can think of. Going to 242 or 231 transfer cases with the ability to go 2WD or 4WD, AWD, etc are a lot more common.

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